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Marey 170,000 BTU Propane Indoor Review

Name: Marey 170,000 BTU Propane Indoor
Brand: Marey
SKU: B08BCS3ZWK

7.6Very good · out of 10Rated from the listing's specs, no buyer reviews yet

Written from the listing's specs, not from our own use · How we rate

If you're after up to 7.5 GPM, the Marey 170,000 BTU Propane Indoor delivers, with built-in freeze protection and a 5-year warranty on top. Think of it for replacing a 40-gallon tank in a mid-size home: 7.6/10 on what its listing documents.

Price$772.46Price on Sep 30, 2026 · may have changed

Check the price on Amazon ↗Affiliate link · price and stock on Amazon

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Specifications

Brand	Marey
Category	Gas tankless water heaters
Fuel	Propane
Stated mounting location	Indoor
Stated maximum flow	7.5 GPM
Stated gas input	170,000 BTU/h
Freeze protection	Stated in the listing
Stated warranty	5 years
ASIN	B08BCS3ZWK

Full listing title: Marey Tankless Water Heater Gas, 7.5 GPM, 170,000 BTU, Liquid Propane, CSA Certified, Indoor

Listing evidence

Fuel	Liquid Propane Full listing title
Stated mounting location	Indoor Full listing title
Stated maximum flow	7.5 GPM Full listing title
Stated gas input	170,000 BTU Full listing title

Updated October 2026

Exact listing, ASIN B08BCS3ZWK

Rating from a published formula

Compared with its closest rivals

Two gas tankless heaters on propane too, with about the same flow, closest to it on our rating, each with a dated price.

Compare side by side ↗

Marey 170,000 BTU Propane Indoor

7.6Very good · out of 10$772.46 Price on Sep 30, 2026 · may have changed

Stated: 7.5 GPM · 170,000 BTU/h
Gas tankless water heaters

This product ↑

Rheem RTG 8.4 GPM Propane Indoor

7.6Very good · out of 10$953 Price on Sep 30, 2026 · may have changed

Stated: 8.4 GPM · 180,000 BTU/h
Gas tankless water heaters

See the review ↗

Rheem RTG 7.0 GPM Propane Indoor

7.5Very good · out of 10$785.13 Price on Sep 30, 2026 · may have changed

Stated: 7 GPM · 160,000 BTU/h
Gas tankless water heaters

See the review ↗

Up to 7.5 GPM from a 170,000 BTU burner

That's the maximum flow the listing states, and headline flows are usually quoted at a mild temperature rise. In January the water comes in nearer 42 °F, so a 105 °F shower needs a 63 °F rise and the unit gives you less; the flow chart in the manual shows how much less. At 2 GPM a shower (our calculator's figure), the headline means two showers and a kitchen tap, less when the water comes in cold.

What it has going for it

What changes in the morning shower rush

Freeze protection. Stated in the listing. Useful in a garage, a crawl space or a cabin that sits empty in winter, as long as the unit keeps power.

5-year warranty. 5 years, per the listing. Read what it needs from you: many makers ask for a licensed install and regular flushing to keep it valid.

One shower at a time, or two?

One at a time, plus the kitchen tap: 7.5 GPM covers that on paper.

Two at once: possible where the tap water comes in warm. In a northern January the second shower is the one that runs lukewarm, so read the flow chart at a 63 °F rise first.

Great for you if…

You run one shower and the kitchen tap at once, rarely more
It will live in a garage, a cabin or another cold spot
You want a long warranty: 5 years are stated

Skip it if…

You want a tight temperature hold: the listing claims no ±1 °F control
You'd rather wait for buyer reviews: none are captured for this listing yet
You want the high-efficiency kind: the listing doesn't call it condensing

Gas, venting and what's in the box

What the Marey 170,000 BTU Propane Indoor listing names:

Up to 7.5 GPM
170,000 BTU/h input
Propane
Indoor mounting
Freeze protection named
CSA, ETL or UL mark named

Warranty & support: 5-year warranty, as stated in the listing · CSA, ETL or UL certification named in the listing.

That is the maker's promise, not ours. Keep the invoice, register the Marey 170,000 BTU Propane Indoor if the maker asks, and read the install conditions: many tankless warranties need a licensed install and regular flushing.

The installation manual has the last word on venting, gas line and clearances; your installer reads it before you order.

Marey 170,000 BTU Propane Indoor, view 3

Price and cost per GPM of stated flow

$772.46 Price on Sep 30, 2026 · may have changed

At the price on Sep 30, 2026, each GPM of stated maximum flow works out at about $102.99 (price ÷ stated GPM, our arithmetic). That puts it around the middle of the 45 indoor gas tankless heaters we have a price and a stated flow for.

The online price is the heater alone. Venting, a bigger gas line where needed and the installer's day are a separate bill, often as big as this one.

The button opens the exact listing (ASIN B08BCS3ZWK), where today's price, stock and seller apply.

Marey 170,000 BTU Propane Indoor, view 4

A better fit for your house?

Two showers and the dishwasher at once? The MIZUDO 199,000 BTU Natural Gas Indoor (9.2/10) states up to 10.3 GPM.

On natural gas, not propane? The Ranein 190,000 BTU Natural Gas Indoor (7.9/10) runs on natural gas.

Our take

The verdict

The Marey 170,000 BTU Propane Indoor earns its place with up to 7.5 GPM and built-in freeze protection. There are no buyer reviews to check it against yet, which makes it a bet on the listing. Where it falls short: no stated temperature hold, while most picks here claim ±1 °F. We'd pick it if you run one shower and the kitchen tap at once, rarely more; otherwise, put it next to the Rheem RTGH 9.5 GPM Propane Indoor first.

Check the price on Amazon ↗Affiliate link · price and stock on AmazonAll gas tankless water heaters →

Living with it

Install day

Old tank out, unit on the wall, vent through the wall or the roof. Plan the gas line for 170,000 BTU/h; a licensed pro handles it, and often a permit.

The first shower

Hot water arrives after the cold already in the pipes, then stays. A trickle from a bathroom tap may not light the burner; open it a bit more.

The first winter

January water comes in colder, so the same unit gives fewer GPM. Stagger the showers if you sized it tight.

Once a year

Flush the heat exchanger with a pump and a descaler (the service valves make it an hour's job), and clean the inlet filter. Our flushing and descaling guide has the checklist.

The one thing we'd check first

Before the Marey 170,000 BTU Propane Indoor ships, check your gas line: 170,000 BTU/h is a lot of gas at once, so ask your plumber whether the existing line can feed it.

Before you buy

Your winter flow

7.5 GPM is the headline. In a northern January the water comes in near 42 °F, so a 105 °F shower needs a 63 °F rise and the real flow drops. Our flow-rate calculator runs the numbers for your house.

Vent and gas line

Ask the plumber to check the gas line size and the meter against the heater's input, and to quote the vent route at the same visit. Our install cost guide shows what that usually adds.

The warranty terms

5 years are stated. Read what it requires: a licensed install, the gas type and regular flushing are the usual conditions.

Flushing

Hard water scales the heat exchanger. Service valves on the water lines turn the yearly flush into an hour with a bucket and a pump; our flushing and descaling guide shows the routine.

How it compares

How the Marey 170,000 BTU Propane Indoor stacks up against the closest alternative, the Rheem RTGH 9.5 GPM Propane Indoor.

Criterion	Marey 170,000 BTU Propane Indoor	Rheem RTGH 9.5 GPM Propane Indoor
Our rating	7.6/10	7.8/10
Max flow	7.5 GPM	9.5 GPM
Gas input	170,000 BTU/h	199,900 BTU/h
Efficiency	Not stated	Condensing
Temperature hold	Not stated	±1 °F stated

Pick the Rheem RTGH 9.5 GPM Propane Indoor if you want our higher-rated option (7.8/10), with more flow (9.5 GPM) and a bigger burner (199,900 BTU/h).

Compare side by side ↗See the Rheem RTGH 9.5 GPM Propane Indoor review →

The score in detail

How we rated it

Spec-based rating on a 4.5–8.5 scale: 4.5 + average of the 4 criteria × 0.4. Capped at 8.5 because no customer evidence is included.

Key specifications

8 / 10

Build, warranty & certifications

8 / 10

Listing documentation

7 / 10

Fit & compatibility

8 / 10

This product has no captured buyer-review record yet, so its rating comes from the documented listing alone: four criteria scored out of 10 (key specifications; build, warranty and certifications; listing documentation; fit and compatibility), placed on a 4.5–8.5 scale. Read the full methodology.

Read the methodology →

Frequently asked questions

Is the Marey 170,000 BTU Propane Indoor any good?

We rate it 7.6/10 (very good). The rating comes from its documented listing alone, as no customer-review record is captured yet.

How much hot water can the Marey 170,000 BTU Propane Indoor deliver?

The listing states a maximum flow of 7.5 GPM and a gas input of 170,000 BTU/h. The headline flow is a mild-weather number: with cold winter water coming in, the same unit gives you less. Read the maker's flow chart at your winter rise, or let our flow-rate calculator do the sums.

Can the Marey 170,000 BTU Propane Indoor be installed indoors?

Yes, the listing says indoor mounting. That means a vent route to the outside, combustion air and a gas line sized for the unit, all as the maker and your local code require. A licensed plumber or gas fitter sorts that out.

What do you get with the Marey 170,000 BTU Propane Indoor?

Its listing states up to 7.5 GPM, freeze protection and a 5-year warranty. These are the seller's figures, not our measurements: how steady the temperature is in your shower and how it copes with your winter water can't be read from a listing.

What should I check before ordering the Marey 170,000 BTU Propane Indoor?

Your winter flow: 7.5 GPM is the headline. In a northern January the water comes in near 42 °F, so a 105 °F shower needs a 63 °F rise and the real flow drops. Our flow-rate calculator runs the numbers for your house. Vent and gas line: ask the plumber to check the gas line size and the meter against the heater's input, and to quote the vent route at the same visit. Our install cost guide shows what that usually adds. The warranty terms: 5 years are stated. Read what it requires: a licensed install, the gas type and regular flushing are the usual conditions. Flushing: hard water scales the heat exchanger. Service valves on the water lines turn the yearly flush into an hour with a bucket and a pump; our flushing and descaling guide shows the routine.

Where can I buy the Marey 170,000 BTU Propane Indoor?

We link to the exact listing on Amazon, where today's price, stock and seller apply. It is an affiliate link, and it has no effect on the rating.

Have you used the Marey 170,000 BTU Propane Indoor yourselves?

No, we haven't used it ourselves. Everything on this page comes from its listing, read line by line and weighed with our published formula.

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